Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 8th Sem 2180903 Power System Planning And Design Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VIII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2180903 Date:25/01/2021
Subject Name:Power System Planning and Design
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Why transmission should be carried out at high voltages?
03
(b) What do you mean by compensation with refer to transmission
04
line? Explain shunt compensation
(c) Discuss the following factors to be taken into consideration in
07
the mechanical design of a transmission line. (1) Loading on the
conductors (2) Span, sag and tension. (3) Clearance from the ground.
Q.2 (a) Explain the terms with reference to reliability assessment
03
(1) MTTF (2) MTTR (3) MTBF
(b) Differentiate between equipment earthing and system grounding.
04
(c) What is meant by stringing of line conductors? What is a stringing
07
chart? How it is prepared and what is its use?
Q.3 (a) What do you understand by tuned power lines?
03
(b) Define critical disruptive voltage and visual critical voltage
04
(c)
A two conductor street main AB, 500 meters in length is fed from
07
both the ends at 250 V. Loads of 50 A,60 A, 40 A and 30 A are
tapped at distances of 100 m,250 m, 350 m and 400 m from the
end A respectively. If the cross section of the conductors is 1
cm2 and specific resistance of the material of the conductors is
1.7? -cm, determine the minimum consumer voltage.
Q.4 (a) What are sag templates?
03
(b) Discuss the various methods of voltage regulation used in distribution
04
system
(c)
A single phase a.c. distributor 500 m long has a total loop impedance
07
of (0.02 +j0.04) and is fed from one end at 250V. It is loaded as
under:
1. 50 A at unity power factor, 200 m from the feeding point.
2.100 A at 0.8 power factor lag, 300 m from the feeding point.
3. 50 A at 0.6 power factor lag, at the far end.
Calculate the total voltage drop in the distributor and the voltage at
the far end.
Q.5 (a) Explain (1) BIL (2) protective margin
03
(b) Discuss why earth wire is required for overhead transmission lines.
04
Where is it located on the transmission line towers?
(c) Explain any one method of measuring soil resistivity and earthing
07
resistance
Q.6 (a) Define dry flash over voltage, wet flashover voltage and impulse
03
1
flash over voltage.
(b) Write a note on location of lightning arrester
04
(c) Explain main considerations in planning and designing
07
generating stations in power systems with reference to the
following: (1) Role of different types of power plants in large
power systems. (2) Choice of generator unit constants.
Q.7 (a) Write a note on selection of location for power plants
03
(b) Write a note on transmission system planning.
04
(c) Discuss in detail the steps in planning and designing electrical
07
distribution schemes
Q.8 (a) Explain radio and television interference.
03
(b) What are the different methods of load forecasting?
04
(c) Explain the financial aspects of power system improvement scheme.
07
*************
2
This post was last modified on 04 March 2021